export type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
/**
 * An object that says by its type which kind of entity it is.
 * @category Format types
 */
export type WithType<T extends string> = {
    /**
     * The type discriminator for this object.
     * @see rdf:type
     */
    readonly type: T;
};
/**
 * An object the edition identifies, so that others can refer to it.
 * @category Format types
 */
export type WithId = {
    /**
     * A unique identifier for this object.
     */
    readonly id: string;
};
/** Whether a value is a date as the format writes one, `YYYY-MM-DD`. */
export declare const isDateString: (value: unknown) => value is string;
/** The items by the key each of them gives, every group in the order its first item came in. */
export declare const groupBy: <T>(items: readonly T[], keyOf: (item: T) => string) => Map<string, T[]>;
/**
 * An object that may carry a note in free text.
 * @category Format types
 */
export type WithNote = {
    /**
     * A free-text note providing additional context.
     * @see crm:P3 has note
     */
    note?: string;
};